I have isolated an RFI problem I'm having to my DAC. A guy called 'Tuckers' responded to
my post in another thread about Z sleeves and said:
The reason radio becomes audible in a system is something called the diode effect. This is where an unstable connection, solder joint, etc. creates a diode effect, hence transferring the radio frequency to audible range. If the Z sleeve is placed before the diode, it may suck out the rfi before it can be translated by the diode. If after, it won't make a difference, as it's not going to remove audible frequencies.
The DAC is a Museatex bitstream which has been modified by its original creator to be a 'Data II'. He added some gold connectors, new caps, better circuitry, etc. Under normal operating situations, I receive varying volume levels of a local radio station called 'Foxy 107'. I have no tuner. If I disconnect the DAC, and use the outputs of my transport/internal DAC, I get silence.
While the DAC and transport are operating, if I wiggle the digital cable, it loses the digital signal and regains it as I wiggle it. So, I thought that might be the answer.... the loose connection... I unplugged my DAC to open it and see if there was anything obviously loose. However, it's not obvious by looking at it.
So, I plugged the DAC in and let it play without a cover... because I wanted to hear a particular CD with it... and lo and behold, no Foxy! However, after it warmed up, Foxy came back.
Anyone know what that would point to?
Thanks,
Carl
